| 1 | E & R Oil | San Angelo, TX 76906 | Oil & Gas Operator | Jun 2025 |
| 2 | Eagle Capital Partners, LLC | Eunice, NM 88231 | Oil & Gas Operator | Jun 2025 |
| 3 | Eagle Production, Inc. | Abilene, TX 79605 | Oil & Gas Operator | Jun 2025 |
| 4 | Eagle Rock Operating Company,LLC | Houston, TX 77252 | Oil & Gas Operator | Oct 2015 |
| 5 | Earthstone Operating, LLC | The Woodlands, TX 77380 | Oil & Gas Operator | Apr 2025 |
| 6 | Eex Corporation | Houston, TX 77060 | Oil & Gas Operator | Feb 2000 |
| 7 | Eggleston, Garaland | Big Lake, TX 76932 | Oil & Gas Operator | Aug 2003 |
| 8 | Elam, Jack G., Inc. | Midland, TX 79702 | Oil & Gas Operator | Nov 2002 |
| 9 | Ellison Lease Operating | Bridgeport, TX 76426 | Oil & Gas Operator | Jun 2025 |
| 10 | Emerald Production Company | Midland, TX 79702 | Oil & Gas Operator | Jun 1995 |
| 11 | Encana Oil & Gas (USA) Inc. | Denver, CO 80202 | Oil & Gas Operator | Oct 2020 |
| 12 | Encore Operating LP | Plano, TX 75024 | Oil & Gas Operator | Apr 2025 |
| 13 | Endeavor Energy Resources, LP | Midland, TX 79701 | Oil & Gas Operator | Jun 2025 |
| 14 | Energen Resources Corporation | Midland, TX 79701 | Oil & Gas Operator | Jan 2021 |
| 15 | Energy Equity Company | Columbus, MT 59019 | Oil & Gas Operator | Apr 2025 |
| 16 | Energy Transfer Crude Marketing LLC | Dallas, TX 75225 | Oil Operator | Mar 2025 |
| 17 | Energyquest II, LLC | The Woodlands, TX 77381 | Oil & Gas Operator | Mar 2025 |
| 18 | Enerquest Oil & Gas LLC | Oklahoma City, OK 73114 | Oil & Gas Operator | Mar 2025 |
| 19 | Enron Oil & Gas Company | Houston, TX 77210 | Oil & Gas Operator | Dec 1999 |
| 20 | Enserch Exploration Inc | Dallas, TX 75206 | Oil & Gas Operator | Apr 2015 |
| 21 | Enwest Resources, Inc. | Midland, TX 79705 | Oil & Gas Operator | Aug 1994 |
| 22 | EOG Resources, Inc. | Midland, TX 79702 | Oil & Gas Operator | Jun 2025 |
| 23 | EP Energy E&P Company, LP | Houston, TX 77210 | Oil & Gas Operator | Jan 2023 |
| 24 | EP Operating Limited Partnership | Dallas, TX 75201 | Oil & Gas Operator | Feb 1995 |
| 25 | Esenjay Exploration, Inc | Houston, TX 77042 | Oil & Gas Operator | Mar 2025 |
| 26 | Estoril Producing Corporation | Midland, TX 79701 | Oil & Gas Operator | Apr 1994 |
| 27 | Et Gathering & Processing LLC | Dallas, TX 75225 | Oil Operator | Dec 2024 |
| 28 | Etc Field Services LLC | San Antonio, TX 78258 | Oil Operator | Jun 2018 |
| 29 | Etc Texas Pipeline, LTD. | Dallas, TX 75225 | Oil Operator | Sep 2023 |
| 30 | Exl Petroleum, LP | Midland, TX 79705 | Oil & Gas Operator | Jun 2017 |
| 31 | Extex Operating Company | Houston, TX 77057 | Oil & Gas Operator | Jun 2025 |
| 32 | Exxon Corporation | Houston, TX 77210 | Oil & Gas Operator | Jun 2024 |
| 33 | Exxon Mobil Corporation | Spring, TX 77389 | Oil & Gas Operator | Jun 2025 |